Microsoft has yet to confirm that it has signed off the Win7 Beta 1 code

Microsoft has yet to confirm that it has wrapped up the upcoming development milestone for the next iteration of the Windows client internally, but speculations are pointing out that Windows 7 Beta 1 has been finalized as early as December 12, 2008. In this context, Windows 7 Beta 1 Build 6.1.7000.0.081212-1400 is reportedly headed for a select pool of testers by the end of 2009. At this point in time Microsoft continues to stick to the same refrain when it comes down to the availability of the next development milestone of Win7 past M3, namely that Windows 7 public Beta is still planned for launch in early 2009.

More or less officially, Microsoft did manage to offer confirmation that Windows 7 Beta 1 would be made available in January 2009. The latest indication in this sense from the Redmond company involves the January 2009 Quarterly Update Kit, which will start shipping on January 5, 2009, to all companies with a Microsoft Action Pack Subscription (MAPS). The Redmond company revealed that Windows 7 Beta would be included in the January 2009 Quarterly Update Kit, but that the package would not actually deliver the bits, as the Beta Build would have to be downloaded.

At the same time, the Redmond giant is luring participants to the MSDN Developer Conferences in 2009 with a promise that attendees will receive a copy of Windows 7 Beta 1, which will be delivered to them after the events. Microsoft Evangelist Keith Combs revealed that the first Windows 7 Beta 1 DVDs would be ready for shipping as early as January 13, 2009...

More here:
http://news.softpedia.com/news/Windows-7-Beta-1-Build-6-1-7000-0-081212-1400-100452.shtml

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Windows 7 Beta 1 Build 6.1.7000.0.081212-1400 V45u80